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 * All rights reserved.
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 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 * conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided
 * with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used to
 * endorse or promote products derived from this software without specific prior written
 * permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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package com.oracle.truffle.llvm.runtime.interop;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.interop.InteropException;
import com.oracle.truffle.api.interop.Message;
import com.oracle.truffle.api.interop.MessageResolution;
import com.oracle.truffle.api.interop.Resolve;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.llvm.runtime.LLVMFunctionDescriptor;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMObjectNativeLibrary;

@MessageResolution(receiverType = LLVMFunctionDescriptor.class)
public class LLVMFunctionMessageResolution {

    @Resolve(message = "IS_NULL")
    public abstract static class ForeignIsNullNode extends Node {

        protected Object access(@SuppressWarnings("unused") VirtualFrame frame, @SuppressWarnings("unused") LLVMFunctionDescriptor object) {
            return false;
        }
    }

    @Resolve(message = "IS_EXECUTABLE")
    public abstract static class ForeignIsExecutableNode extends Node {

        protected Object access(@SuppressWarnings("unused") VirtualFrame frame, @SuppressWarnings("unused") LLVMFunctionDescriptor object) {
            return true;
        }
    }

    @Resolve(message = "EXECUTE")
    public abstract static class ForeignExecuteNode extends Node {

        @Child private LLVMForeignCallNode executeNode;

        protected Object access(LLVMFunctionDescriptor object, Object[] arguments) {
            return getHelperNode().executeCall(object, arguments);
        }

        private LLVMForeignCallNode getHelperNode() {
            if (executeNode == null) {
                CompilerDirectives.transferToInterpreterAndInvalidate();
                executeNode = insert(LLVMForeignCallNodeGen.create());
            }

            return executeNode;
        }
    }

    @Resolve(message = "INVOKE")
    public abstract static class ForeignBindNode extends Node {

        protected Object access(LLVMFunctionDescriptor object, String name, @SuppressWarnings("unused") Object[] arguments) {
            if ("bind".compareToIgnoreCase(name) == 0) {
                return object;
            } else {
                CompilerDirectives.transferToInterpreter();
                return UnsupportedMessageException.raise(Message.INVOKE);
            }
        }
    }

    @Resolve(message = "IS_POINTER")
    public abstract static class ForeignIsPointerNode extends Node {

        @Child LLVMObjectNativeLibrary objectNative = LLVMObjectNativeLibrary.createGeneric();

        protected boolean access(@SuppressWarnings("unused") VirtualFrame frame, LLVMFunctionDescriptor object) {
            return objectNative.isPointer(object);
        }
    }

    @Resolve(message = "AS_POINTER")
    public abstract static class ForeignAsPointerNode extends Node {

        @Child LLVMObjectNativeLibrary objectNative = LLVMObjectNativeLibrary.createGeneric();

        protected long access(@SuppressWarnings("unused") VirtualFrame frame, LLVMFunctionDescriptor object) {
            try {
                return objectNative.asPointer(object);
            } catch (InteropException e) {
                throw e.raise();
            }
        }
    }

    @Resolve(message = "TO_NATIVE")
    public abstract static class ForeignToNativeNode extends Node {

        @Child LLVMObjectNativeLibrary objectNative = LLVMObjectNativeLibrary.createGeneric();

        protected Object access(@SuppressWarnings("unused") VirtualFrame frame, LLVMFunctionDescriptor object) {
            try {
                return objectNative.toNative(object);
            } catch (InteropException e) {
                throw e.raise();
            }
        }
    }
}
